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Table 2 Characteristics of the study cohort (n = 1438)

From: Polymorphisms in estrogen-metabolizing and estrogen receptor genes and the risk of developing breast cancer among a cohort of women with benign breast disease

Characteristic n %
Race   
   Caucasian 1438 100.0
Age, yearsa   
   <50 533 37.1
   50 to 60 411 28.6
   >60 494 34.3
   Missing 0 0.0
Education, yearsa   
   less than a high school degree 259 18.0
   high school degree 714 49.7
   some college 463 32.2
   Missing 2 0.1
Menopausal statusa   
   Pre-menopausal 377 26.2
   Peri-menopausal 35 2.4
   Post-menopausal 995 69.2
   Missing 31 2.2
Family history of breast cancera   
   No 715 49.7
   Yes 275 19.1
   Missing 448 31.2
Ever been pregnant (%)b   
   No 176 12.2
   Yes 1255 87.3
   Missing 7 0.5
Age at first birth (years, %)b   
   Nulliparous 176 12.2
   20 347 24.1
   20 to 24 539 37.5
   ≥25 339 23.6
   Missing 37 2.6
Age at menarche (years, %)b   
   <12 268 18.6
   12 to 13 763 53.1
   >13 386 26.8
   Missing 21 1.5
Height, inchesa   
   <62 411 28.6
   62–64 419 29.1
   >64 608 42.3
   Missing 0 0.0
Weight, poundsa   
   <130 354 24.6
   130–<145 318 22.1
   145–<165 377 26.2
   ≥165 387 26.9
   Missing 2 0.1
BMI, kg/m2, a   
   <24.9 744 51.7
   25.0 – 29.9 433 30.1
   ≥30 259 18.0
   Missing 2 0.1
Smoking statusa   
   Never 839 58.3
   Former 366 25.5
   Current 232 16.1
   Missing 1 0.1
Current alcohol drinkera   
   No 814 56.6
   Yes 413 28.7
   Missing 211 14.7
  1. a data from 1989 questionnaire
  2. b data from 1996 questionnaire